When your done knitting how do you get it off with out wreaking it?

you must do what is known as a bind off or cast off ( same thing) you start by knitting the first two stitches as you have been knitting .. then using your left needle insert it into the first stitch you just knitted and pass it over the second stitch you just knitted .. you should have just one stitch again on the right needle .. now knit the next stitch and once again using the left needle pass the one stitch over the other .. continue one at a time knitting one stitch .. passing over.. knitting one stitch passing over till all but one stitch remains.. place yarn over the needle and pull thru remaining stitch .. pull to tighten ..